73 lines
1.5 KiB
Text
73 lines
1.5 KiB
Text
goal: realtime to in game time conversion
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There is no need to keep days
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minecraft day is 0 - 24000 ticks
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where 6000 ticks is noon (peak sun) and 18000 is midnight (peak moon)
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irl day is 0 - 86400 seconds
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0. s = epoch % 86400 to get seconds since midnight
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^
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(* scale) here
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1. t = s / 72.0 to fit into minecraft day
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2. t = t * 20 to convert that to ticks
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3. t = t - 6000 to align noon and midnight
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this leaves us with negative time, so
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4. t = floorMod(t, 24000) to wrap if negative
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example:
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epoch = 1713593340
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0. getting seconds since midnight
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s = epoch % 86400
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s = 1713593340 % 86400
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s = 22140
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1. conversion to minecraft day length
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gs = s / 72.0
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gs = 22140 / 72.0
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gs = 307.5
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2. to ticks
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t = gs * 20
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t = 307.5 * 20
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t = 6150
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3. step 3
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t = t - 6000
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t = 6150 - 6000
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t = 150
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4. wrapping
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t = floorMod(150, 24000)
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t = 150
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goal: frequency of time update
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t = 72 / scale
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t is the period, in ticks of course
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to see how many irl seconds a tick represents:
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s = 3.6 * scale
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(from 1 / (1/72 * 20 * scale))
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however, some scales result in fractions
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here's how many in game aligned seconds have passed at the end of a real day:
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84000 / 72 * scale * floor(72/scale)
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for scale 0.99: 83160
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so we'll be 14 minutes behind
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solution? for now let's warn and update time every tick
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to check:
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scale * floor(72/scale) == 72
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goal: offsetting by player position
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t = (longitude / 15) * 1000 * scale
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accounting for sunrise and sunset
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TODO, idk yet without
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update: this is now possible with 0.8.0 api
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